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March 14, 1933. .1. E. REHOR FLUID PRESSURE MOTOR Filed Sept. l2, 1929 3 lSheecsSheeiI 1 HMT QN vQ Q.

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March 14, 1933.

5 Sheets-Sheet 2 Filed Sept. l2, 1929 March 14, 1933. ll E* REHOR FLUID PRESSURE MOTOR Filed Sept. 12, 41929 5 Sheets-Sheet 3 Nuo' Ik lul 00000000000000 G Olmw O O .IIQIOIUMIOIIO G l .mh 11i i 11| il n Q Q Q Q 'TTES incest J'OSEPH-EDWARD REHOR, OF SHAKER HEIGHTS, OHIO, ASSIGNGR T0 THE ROTOR AIR TOOL COMPANY, OF CLEVELAND, OHIO, A. CORPORATION OF OHIO K l FLUID PRESSURE MOTOR Application led September 12,1929. Serial No. $92,029.

This invention relates to liuid pressure motorssuch, for example, as are commonly employed for operatingy grinders and other' tools.

More particularly, the invention relates to that type of rotary motor tool wherein there. is a rotor carried by the spindle and a slidable abutment blade which is either carried by the stationary part of the motor and at its-inner edge engages the rotor, or carried by the rotor and at its outer edge engages the rotor bore. rlhe 'invention relates especially tothe former arrangement wherein the abutment blade or blades are slidably mounted in the stationary part of the motor.

Motors ofthe abovetype have been used quite extensively and it is common, particularly when the abutment blade or blades are slidably mounted in the stationary part of the motor, that they be actuated by iiuid pressure to hold the same in engagement with thev ro* tor when the blade is carried by the stationary part of the motor or with the cylinder bore when carried by the rotor. This expedient has proven to be useful but heretofore not entirely satisfactory in view of the fact that the fluid under pressure which acts on lthe blade has been taken from a point such that the actual pressure exerted onV the blade varies very materially with the speedv of the motor. The fluid pressure on the blade decreases as the motor speed increases and therefore theelficiency of the motor is reduced due to the factthat the blade is not held at all times in engagement with the rotor or cylinder bore and leakage offluid and, consequently, loss of power occurs.

The object ofthe present invention is to provide a construction wherein live motive fluid whose pressure is constant or unaffected 4Q by the speed of the motor is led to the blade so that it may act thereon and cause it to be held against the part which it is intended to engage at all times under the maximum pressure.

The above and other objects are attained by the present invention which may be here briefly summarized `as consistingin certain novel details of construction and combinations and arrangements of parts which Vwill be described in thespeci'fication and set forth in the appended claims. y

In the accompanying sheetsvof drawings wherein I have shovvntvvo slightly different embodiments of the invention,

Figure 1 is a central, longitudinal, sectional view of a motor of well-known form and constructed in accordancev with my invention. vFig. 2 is a plan view looking at the top of Fig. 1, with the cap `plateremovedl Fig. 3 is a longitudinal,sectional View sub stantially on the line 3-3 of Fig. 4.

Fig. 4 is atransverse, sectional view substantially along the line 4.-4 of Fig. 3Q

' Fig'. 5 is a transverse, sectional view subrstantially on the line 5-5 of Fig. 3.

Fig. 6 is a View of a slightly modified form of motor, the motor proper being in sidel elevation and the handle in section; and Y Fig. 7 is a bottom view, or inverted plan, of Fig.` 67 with the cap plate removed,`this lview corresponding to Fig. 2.

The structure of the motor 4in so far'as the mainl parts and the arrangement of the parts areconcerned is substantially the same as that disclosed in the Van Hamersveld and.` Cook Patent 1,653,748 and, therefore, the construction of the motor proper Vwill be given briefly. r1`he motor spindle 10 has secured to it in this instance two eccentric rotors 11 and 12 adapted to rotate in a cylindrical bore formedin the stationarypart or body 13 of the motor. These rotors are separated by a center bearing 14 with the bearing part-s enclosed in a housing, held in place by screw 15, fitted into the central portion of the motor body 13. At the ends of the cylinder body 13 are end plates 16 and to these end plates are secured an end bracket 17 with a handle 18 and an end bracket 19 with ahandle 90 portion through which the spindle 10 projects.

The cylinder body is provided with radial slots milled inwardly from opposite ends toward the central portion of the body and in these slots are the radially slidable abutment blades 2O whose inner edges are maintained in engagement with the rotors 11 and 12 by `fluid pressure supplied to the outer portions of the slots, the latter being closed by removable cover plate 21, a suitable gasket being provided between the cover plate and the cylinder body to present any leakage of fluid. By reference to Fig-4 it will be seenl that the cylinder body Vhas a lateral extension in ywhich are provided the slots for the blades, as well as passageways to be subsequently referred to. The cylinder body 13, end plates 16, and brackets 17 and 19 are clamped rigidly together by a series of axially extending bolts 22 and to perfectly align the parts bushings 23 which surround the bolts are fitted into accurately formed openings in the end portions of the cylinder body, in the end plates, and in the brackets. For a purpose to be subsequently explained, a suitable clearance is provided between the bolts and the bores of the bushings.V

The handle 18 in the construction illus- 0 trated in Figs. 1 to 5 is known as a straight handle, this handle having afluid passageway 24 extending therethrough from its outer end,r this passageway being shown by dotted lines in Fig. 1 and by full lines in Fig. 5.

a lubricantchamber alongside the major portion of the fluid passageway 24 but the same is not here illustrated, but is illustrated in Y the Van Hamersveld and Cook patent re- 0 ferr-ed to above. By a suitable connection the fluid is supplied tothe outerend of passageway 24, the fluid usually employed being compressed air. From the inner end of the passageway 24V the fiuidis adapted to pass through a valve here shown as a sleeve-valve 25, manually controlled by a handle 26, to a chamber 27 (see Figs. 1 and 5) which lies alongside and just outwardly of a governor chamber 28, the chambers 27 and 28, as well 0 as the passageway 24 being in the bracket 17. The inner end of the spindle 10 projects very slightly through or beyond the end plate `which is next to the bracket 17 and secured to the end ofthe spindle, and located in the 5 governor chamber 28 is a governor 29 which is preferably provided to control the speed of the motor so as to prevent racing and possible injury to the motor. Any suitable governor may bev employed but I have here illustrated a governor of the type disclosed and claimed in a prior application led in the name of Hal L. Cook, .l une 2, 1928, Serial No. 282,311. This governor has ya governor body with a sleeve-like extension 30 which projects through a bushing filled in an open- The handle is generally provided also with ing in the wall 3l which separates the chamber 27 from the chamber'28, this opening being in line with the axis of the spindle 10. Additionally the governor has a sleeve 32 which is rotatable on the sleeve-like extensageway 35 shown by dotted lines in Fig. 3

and by full lines in Fig. 4, this passageway 85 being bored through the lateral extension of the cylinder body for the full length of the latter, as well as through the end plates 16, the forward bracket 19 closing theforward end of this passageway.

From the passageway 35 the fluid passes inwardly by way of auxiliary inlet passageways 36 to the cylinders, these passageways 36 being drilled from the outer face of the lateral extension ofthe cylinder bodyuto the inner bore, and intersecting the main inlet passageway 35. The fluid yis exhausted from the cylinders byway of auxiliary exhaust passageways 37 which are drilled from the outer face of the lateral extension of the ycylinder body to the cylinder bore intersecting the main exhaust passageway 38 bored axially through the cylinder body from end to end in parallel relation with the inlet passageway 35. A series of exhaust ports 39 extend from the passageway 38 through the outer surface of the cylinder body.

As explained in the Van Hamersveld and Cook patent the motive fluid is supplied to the outer portions of the guideways for the abutment blades so as to press the blades against the rotors by short ducts which connect the outer portions of the guideways with the auxiliary passageways 36, but this method of conducting the motive fluid to the abutment blade guideways and, in fact, any arrangement of fluid supply ducts which receive fluid from the main inlet passageway or from any point in the fluid line on the motor side of the governor are open to the objection that the pressure of the motive fluid supplied to the guideways varies with the motor speed, being decreased as the motor speed increases, resulting in loss of power as previously explained.

In accordance with the present invention the motive fluid is supplied in an entirely new way which overcomes the objection noted above and this will now be explained. By reference to Figs. 3 and 5 it will be seen that a short passageway 39 is provided from a point in advance of the governor, in this instance from the chamber 27, to one of the openings here designated 40 formed in the bracket 17 to receive one of the clamping bolts 22, there being a considerable clearance between the bore of this opening 40 and the surface of the bolt. The motive fluid is adapted to pass along this passageway and between the bolt and the adjacent bushing 28 and into the passageway 40a formed in the cylinder' body for this same bolt, which passageway has a clearance between its bore and the bolt. It might be here stated that the ends of the passageway for the `bolt referred to, and in fact the ends of the passageways for all the bolts, are closed and sealed by washers 41 and by the bolt heads and nuts so that leakage of fluid where the bolts emerge from the brackets 17 and 19 is absolutely prevented. From the passageway 40a the motive fluid is conducted by a passageway 42 to a ygroove 43 formed inthe central portion of the cylinder body beneath the cover plate 21, and communicating at its ends with the guideways of the two abutment blades 20. In this way live motivel fluid is conducted under the maximum pressure of the fluid from a point in advance of the governor to thev abutment blade guideways and this pressure remainsconstant irrespective of the speed of the motor, with the result that the blades will be held against the external surfaces of the rotors under aI constant and maximum pressure ofthe motive Huid. In view of the fact that the only movement of motive fluid through the passageways leading to the outer portions of the abutment blade guideways is due to the inward and outward movement ofthe abutment blades, the actual flow of motive fluid is very slight and no greater clearances than illustrated in the drawings are required between the bolt 22 and the parts which surround it to give the maximum fluid pressure on the outer ends of the blades.

In the construction shown in Figs. 6 and 7, the same motor construction precisely is provided aside from the shape of the handle 44 forming a part of the end bracket 45, this bracket corresponding in function to the bracket 17 of the first describe-d construction. The motive fluid passes through a passageway 46 formed in one portion of the handle 44, and by way. of a valve 47 into a passageway 48 to the governor which may be the same as that first described or any suitable governor, and into the governor chamber 49 formed in the bracket 45, as in the bracket -17 of the first construction.

In this instance motive fluid is supplied underl ymaxi-mum pressure tor the outer portions of the abutment blade guideways in substantially ,the manner first described, a passageway '53 being provided to connect the passageway 48 with the' clearance space 54 v,be-v

tween one of the clamping bolts 55 and the bore formed inthe bracket 45 for-the bolt.

The motive fluid passes along the" bolt bei Amodified motor are precisely the same as with that first described. l

I have herein illustrated a convenient way of conducting the motive fluid from a pomt in the fluid line where constant'maximum pressure is obtainable to the outer ends of the abutment blades, but it will be obvious that the motive fluid may be conducted to the blades by passageways formed in other ways than herein illustrated. Likewise it will be understood that while I have illustrati-idV motors each having two rotors, the invention is equally applicable to a motor having one rotor, or more than two rotors. Likewise it will be understood that while I'have illustrated that type of motor wherein the blades have reciprocating motion in the stationary part of the motor, it may be applied with equal advantage to a motor wherein the abutment blades slide in the rotor itself and en- Y gage the cylinder bore. In the latter event the motive fluid will be supplied through the spindle to the inner ends of the blades so that their outer ends will be held under the constant maximum fluid pressure against the cylinder bore.

I therefore aim in my claims to cover all modifications which do not involve a departure from the spirit and scope of the invention as set forth in the appended claims.

Having thus described my invention, what I claim is:

1. A motor comprising a cylinder body with a member attached to an end thereof, a clamping bolt, and an opening extending through said body and member for the clamping bolt, a rotor in the cylinder bore, a slidable abutment blade in the cylinder body and at its inner end adapted to engage the surface of the rotor, and means including said bolt opening kfor supplying fluid pressure to the outer end of the blade.

2. A. motor comprising a cylinder body with members attached to the ends thereof, a clamping bolt and an opening extending through said body and members for the clamping bolt, a rotor in the cylinder bore, a sldable abutment blade in the cylinder body andat its inner end adapted to engage the surface of the rotor, and means for supplying substantially constant fluid pressure to the outer end of the blade comprising a fluid passageway connected to said bolt opening and a fluid passageway leading from the bolt opening to the cylinder body at the outer end of the blade.

Y Intestmony whereof, I hereunto ax my signature.

JOSEPH EDWARD REHOR 

